Impact of Aerodynamic Load on Lining Defects of High Speed Railway Tunnel
With the increase in operation speed of high speed railway trains,the aerodynamic load has become an important additional load for tunnel structures.Especially when there are initial defects in the plain concrete secondary lining,the aerodynamic load will have a great impact on lining safety.The numerical manifold method based on fracture mechanics and the finite element method based on the load-structure model were used to study the impact of aerodynamic load in two defect cases,i.e.initial cracks and insufficient thickness of plain concrete secondary lining.The results indicate that when there are initial defects in the plain concrete secondary lining,the aerodynamic load has a great impact on the durability and long-term stability of the defective parts;when there are cracks in the tunnel lining,the stress intensity factor at the crack tip increases by more than 150％under the aerodynamic load;when the lining thickness is insufficient,the tensile stress at the defective part increases by 54％under the aerodynamic load,and the lining is in a"tension-compression"cyclic state.The results of this study provide a reference for the long-term stability and durability design of plain concrete structures of high speed railway tunnels.
high speed railway tunnelaerodynamic loadplain concretesecondary lininginitial defects
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